Physics: Post your doubts here!

[MShaheerUddin]

Please provide a link to the question. The link you provided earlier seems to be for a different subject.

https://www.cambridgeinternational.org/images/429280-june-2016-question-paper-41.pdf
This was the paper .. I mistakenly attached 9702 link..

 

[MShaheerUddin]

Please help me with this ...
B(i) only

 

[MShaheerUddin]

Also help with this part c

 

[hellodjfos;s'ff]

View attachment 64643
Please help me with this ...
B(i) only

So P has to be that curve since P is the first nuclide that begins decaying so it must have existing amount hence it has a non-zero y intercept. D has to be the curve with an increase and decrease because at first when P decays, the rate of formation of D is high so there are lots of D nuclide being made but after a while the D nuclide also begins decaying into S nuclide so it has to decrease in amount later. S is always increasing because when P decays, it forms D and when D decays it forms S so all the previous nuclide are eventually decaying to form S hence its amount will increase always.

 

[hellodjfos;s'ff]

Also help with this part cView attachment 64645

This would be my official answer to c: Decay constant is probability of decay per unit time. Since E has a smaller decay constant, it is less likely to decay into F and since F has a larger decay constant it is more likely to decay into G. Hence, the amount of F is always small as the rate of decay of F is greater than rate of formation of F. Alternatively, greater decay constant means lower half life(inverse relation), hence E has a greater half life and F has a lower half life, thus E decays less often to form F while F decays quickly form G. Therefore, F is always small as again rate of decay of F is greater than its rate of formation.

 

[MShaheerUddin]

This would be my official answer to c: Decay constant is probability of decay per unit time. Since E has a smaller decay constant, it is less likely to decay into F and since F has a larger decay constant it is more likely to decay into G. Hence, the amount of F is always small as the rate of decay of F is greater than rate of formation of F. Alternatively, greater decay constant means lower half life(inverse relation), hence E has a greater half life and F has a lower half life, thus E decays less often to form F while F decays quickly form G. Therefore, F is always small as again rate of decay of F is greater than its rate of formation.

Thank a lot .. you are genius!

 

[MShaheerUddin]

can you help me with last part iii

 

[hellodjfos;s'ff]

View attachment 64652 can you help me with last part iii

The question asks for the time between the minimum and maximum frequency which would be 0.5period of the information signal.
The information signal has a frequency of 10kHz so this is the frequency at which the wave operates. Use f=1/T to find the period and half that to get the time.

 

[lolo lolo]

I need physics paper4 march 2019 paper for IGCSE 0625

 

[Adeen Atif]

Tips for graphs in both P1 and P2??

 

[mittul8yu98]

please help urgent

 

[blymphocytes]

Any tips for last minute paper 4 revision....idk anythinggggg

 

[Kashintha]

anyone have an idea about the practical test this time?

 

[Rohan Zulfiqar]

Can anyone please explain me how to solve question 2 (b) (v) of 9702/23/M/J/18 .
According to the formula, we have two v.
fo = fsv/v-vs
But how to solve and get v ?

 

[Rohan Zulfiqar]

Also, the (-6.30) which is dividing (4850 x v),
will go add to the other side or will multiply ?

 

[Super Saiyan 007]

On what basis do you maintain significant figures when making a table in P3 ?

 

[Rohan Zulfiqar]

On what basis do you maintain significant figures when making a table in P3 ?

I did'nt understand your question. We use two sf at the end of an answer. But, during calculations, we use more

 

[student3737]

How do you do bii) they multiplied the charge from bi by 2

 

[Super Saiyan 007]

I did'nt understand your question. We use two sf at the end of an answer. But, during calculations, we use more

Never mind . Any useful tip regarding Electricity question in P3 because I always find setting up the circuit intriguing . TIA!

 

[Super Saiyan 007]

Anyone giving P33 on 7 May?